Calculation Methods in directA Versions

NETZSCH directA is the software for direct analysis of the thermogravimetric data, measured under the conditions of modulated temperature. The software calculates activation energy of chemical reactions from one modulated thermogravimetric measurement as the continuous function of time, temperature or reaction conversion over the whole measurement.

The description of all calculations methods used in both directA versions (Lite and Full) can be found in the following article:

Introduction

Modulated Thermogravimetry is the analysis method of the thermograviometric data measured under conditions of the modulated themperature. Modulated temperature is the sum of the underlying linear heating or constant temperature and sinus-shaped temperature oscillations with user-defined amplitude and period.

The directA software calculates activation energy of chemical reactions from one thermogravimetric measurement. The activation energy is shown as the continuous function of time, temperature or reaction conversion over the whole measurement.

Data Import

The software can import data in plain text ASCII format. These data files can be created by export from the software connected with your instrument. Another way is tab-delimited ASCII export from Microsoft® Excel. Data for analysis must be time-equidistant.

During data import user must point here the column number for time, temperature and modulated Thermogravimetric signal. Additional required information is the temperature amplitude and oscillation period.

Imported data can be shown as the one of signal type: TG, DTG or modulated temperature. X-Axis is time, temperature or reaction conversion.

Import dialog for the ASCII data with three columns: time, temperature, TG signal.

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